Replace another 2 .URL occurrences with .Permalink (#275)

* Replace another 2 .URL occurrences with .Permalink

This is basically a completion of #216

* Revert site-navigation URL change

layouts/partials/social-share.html

@@ -1,5 +1,5 @@
 {{ $title := .Title }}
-{{ $url := printf "%s" .URL | absLangURL }}
+{{ $url := printf "%s" .Permalink | absLangURL }}
 {{ $icon_size := "32px" }}
 
 {{ if not .Params.disable_share }}
@@ -23,4 +23,4 @@
       {{ partialCached "svg/linkedin.svg" (dict "size" $icon_size) $icon_size }}
     </a>
   </div>
-{{ end }}
+{{ end }}